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Radiation Fog. Radiation fog is a very common type of fog throughout the United States. It is most prevalent during the fall and winter. It forms overnight as the air near the ground cools and stabilizes. When this cooling causes the air to reach saturation, fog will form. Fog will first form at or near the surface, thickening as the air ...
- How Fog Forms
How Fog Forms. Radiation Fog. This type of fog forms at...
- A. Fog Types
Fog forms when the temperature and dew point of the air...
- How Fog Forms
How Fog Forms. Radiation Fog. This type of fog forms at night under clear skies with calm winds when heat absorbed by the earth’s surface during the day is radiated into space. As the earth’s surface continues to cool, provided a deep enough layer of moist air is present near the ground, the humidity will reach 100% and fog will form.
- Radiation Fog. Radiation fog forms at night when the surface cools, causing the air above it to cool as well. If the air has enough moisture, this cooling will lead to saturation and form fog.
- Advection Fog. Advection fog forms when warm, moist air moves over cooler ground or water. It is relatively shallow and often associated with an inversion.
- Upslope Fog. Upslope fog forms when moist air flows upward over rising terrain, causing it to cool adiabatically to its dew point temperature. “Adiabatic” is a word used to describe the process that causes rising air to cool and sinking air to warm.
- Steam Fog. Steam fog, also known as evaporation fog, forms when cold air comes into contact with warm water. The warmer water evaporates into the cooler air above, increasing the air’s moisture content.
Fog forms when the temperature and dew point of the air approach the same value (i.e., dew-point spread is less than 5°F) either through cooling of the air (producing advection, radiation, or upslope fog) or by adding enough moisture to raise the dew point (producing steam or frontal fog). When composed of ice crystals, it is called ice fog.
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Fog can form multiple ways, depending on how the cooling occurred that caused the condensation. Radiation fog is formed by the cooling of land after sunset by infrared thermal radiation in calm conditions with a clear sky.
Radiation fog. (Section 3.2.1.1.1) Radiation fog is formed when the ground surface cools through radiation, usually at night, cooling the air just above the ground to its saturation temperature. Radiation fog is known as “shallow fog“ or ”ground fog" when it occurs in a shallow enough layer that it does not restrict horizontal visibility ...
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Radiation fog develops on clear nights, generally under a ridge, when humidity is high. Under a clear sky, the earth's surface, and consequently the layer of air at the surface, cools steadily overnight. If the air mass at the surface is able to cool to the dew point temperature and reach 100% humidity, there is a risk of radiation fog forming.
